drivers/char/drm/drm_stub.c

   1 /**
   2  * \file drm_stub.h
   3  * Stub support
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  */
   7
   8 /*
   9  * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
  10  *
  11  * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include "drmP.h"
  37 #include "drm_core.h"
  38
  39 unsigned int drm_cards_limit = 16;      /* Enough for one machine */
  40 unsigned int drm_debug = 0;             /* 1 to enable debug output */
  41 EXPORT_SYMBOL(drm_debug);
  42
  43 MODULE_AUTHOR( CORE_AUTHOR );
  44 MODULE_DESCRIPTION( CORE_DESC );
  45 MODULE_LICENSE("GPL and additional rights");
  46 MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
  47 MODULE_PARM_DESC(debug, "Enable debug output");
  48
  49 module_param_named(cards_limit, drm_cards_limit, int, 0444);
  50 module_param_named(debug, drm_debug, int, 0666);
  51
  52 drm_head_t **drm_heads;
  53 struct drm_sysfs_class *drm_class;
  54 struct proc_dir_entry *drm_proc_root;
  55
  56 static int drm_fill_in_dev(drm_device_t *dev, struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver)
  57 {
  58         int retcode;
  59
  60         spin_lock_init(&dev->count_lock);
  61         init_timer( &dev->timer );
  62         sema_init( &dev->struct_sem, 1 );
  63         sema_init( &dev->ctxlist_sem, 1 );
  64
  65         dev->pdev   = pdev;
  66
  67 #ifdef __alpha__
  68         dev->hose   = pdev->sysdata;
  69         dev->pci_domain = dev->hose->bus->number;
  70 #else
  71         dev->pci_domain = 0;
  72 #endif
  73         dev->pci_bus = pdev->bus->number;
  74         dev->pci_slot = PCI_SLOT(pdev->devfn);
  75         dev->pci_func = PCI_FUNC(pdev->devfn);
  76         dev->irq = pdev->irq;
  77
  78         /* the DRM has 6 basic counters */
  79         dev->counters = 6;
  80         dev->types[0]  = _DRM_STAT_LOCK;
  81         dev->types[1]  = _DRM_STAT_OPENS;
  82         dev->types[2]  = _DRM_STAT_CLOSES;
  83         dev->types[3]  = _DRM_STAT_IOCTLS;
  84         dev->types[4]  = _DRM_STAT_LOCKS;
  85         dev->types[5]  = _DRM_STAT_UNLOCKS;
  86
  87         dev->driver = driver;
  88
  89         if (dev->driver->preinit)
  90                 if ((retcode = dev->driver->preinit(dev, ent->driver_data)))
  91                         goto error_out_unreg;
  92
  93         if (drm_core_has_AGP(dev)) {
  94                 dev->agp = drm_agp_init(dev);
  95                 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP) && (dev->agp == NULL)) {
  96                         DRM_ERROR( "Cannot initialize the agpgart module.\n" );
  97                         retcode = -EINVAL;
  98                         goto error_out_unreg;
  99                 }
 100                 if (drm_core_has_MTRR(dev)) {
 101                         if (dev->agp)
 102                                 dev->agp->agp_mtrr = mtrr_add( dev->agp->agp_info.aper_base,
 103                                                                dev->agp->agp_info.aper_size*1024*1024,
 104                                                                MTRR_TYPE_WRCOMB,
 105                                                                1 );
 106                 }
 107         }
 108
 109         retcode = drm_ctxbitmap_init( dev );
 110         if( retcode ) {
 111                 DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
 112                 goto error_out_unreg;
 113         }
 114
 115         return 0;
 116
 117 error_out_unreg:
 118         drm_takedown(dev);
 119         return retcode;
 120 }
 121
 122 /**
 123  * File \c open operation.
 124  *
 125  * \param inode device inode.
 126  * \param filp file pointer.
 127  *
 128  * Puts the dev->fops corresponding to the device minor number into
 129  * \p filp, call the \c open method, and restore the file operations.
 130  */
 131 int drm_stub_open(struct inode *inode, struct file *filp)
 132 {
 133         drm_device_t *dev = NULL;
 134         int minor = iminor(inode);
 135         int err = -ENODEV;
 136         struct file_operations *old_fops;
 137
 138         DRM_DEBUG("\n");
 139
 140         if (!((minor >= 0) && (minor < drm_cards_limit)))
 141                 return -ENODEV;
 142
 143         if (!drm_heads[minor])
 144                 return -ENODEV;
 145
 146         if (!(dev = drm_heads[minor]->dev))
 147                 return -ENODEV;
 148
 149         old_fops = filp->f_op;
 150         filp->f_op = fops_get(&dev->driver->fops);
 151         if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
 152                 fops_put(filp->f_op);
 153                 filp->f_op = fops_get(old_fops);
 154         }
 155         fops_put(old_fops);
 156
 157         return err;
 158 }
 159
 160
 161 /**
 162  * Register.
 163  *
 164  * \param pdev - PCI device structure
 165  * \param ent entry from the PCI ID table with device type flags
 166  * \return zero on success or a negative number on failure.
 167  *
 168  * Attempt to gets inter module "drm" information. If we are first
 169  * then register the character device and inter module information.
 170  * Try and register, if we fail to register, backout previous work.
 171  */
 172 int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 173               struct drm_driver *driver)
 174 {
 175         drm_device_t *dev;
 176         int ret;
 177
 178         DRM_DEBUG("\n");
 179
 180         dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 181         if (!dev)
 182                 return -ENOMEM;
 183
 184         pci_enable_device(pdev);
 185
 186         if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
 187                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 188                 goto err_g1;
 189         }
 190         if ((ret = drm_get_head(dev, &dev->primary)))
 191                 goto err_g1;
 192
 193         /* postinit is a required function to display the signon banner */
 194         /* drivers add secondary heads here if needed */
 195         if ((ret = dev->driver->postinit(dev, ent->driver_data)))
 196                 goto err_g1;
 197
 198         return 0;
 199
 200 err_g1:
 201         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 202         return ret;
 203 }
 204 EXPORT_SYMBOL(drm_get_dev);
 205
 206 /**
 207  * Get a secondary minor number.
 208  *
 209  * \param dev device data structure
 210  * \param sec-minor structure to hold the assigned minor
 211  * \return negative number on failure.
 212  *
 213  * Search an empty entry and initialize it to the given parameters, and
 214  * create the proc init entry via proc_init(). This routines assigns
 215  * minor numbers to secondary heads of multi-headed cards
 216  */
 217 int drm_get_head(drm_device_t *dev, drm_head_t *head)
 218 {
 219         drm_head_t **heads = drm_heads;
 220         int ret;
 221         int minor;
 222
 223         DRM_DEBUG("\n");
 224
 225         for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
 226                 if (!*heads) {
 227
 228                         *head = (drm_head_t) {
 229                                 .dev = dev,
 230                                 .device = MKDEV(DRM_MAJOR, minor),
 231                                 .minor = minor,
 232                         };
 233
 234                         if ((ret = drm_proc_init(dev, minor, drm_proc_root, &head->dev_root))) {
 235                                 printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
 236                                 goto err_g1;
 237                         }
 238
 239
 240                         head->dev_class = drm_sysfs_device_add(drm_class,
 241                                                                MKDEV(DRM_MAJOR,
 242                                                                      minor),
 243                                                                &dev->pdev->dev,
 244                                                                "card%d", minor);
 245                         if (IS_ERR(head->dev_class)) {
 246                                 printk(KERN_ERR "DRM: Error sysfs_device_add.\n");
 247                                 ret = PTR_ERR(head->dev_class);
 248                                 goto err_g2;
 249                         }
 250                         *heads = head;
 251
 252                         DRM_DEBUG("new minor assigned %d\n", minor);
 253                         return 0;
 254                 }
 255         }
 256         DRM_ERROR("out of minors\n");
 257         return -ENOMEM;
 258 err_g2:
 259         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 260 err_g1:
 261         *head = (drm_head_t) {.dev = NULL};
 262         return ret;
 263 }
 264
 265
 266 /**
 267  * Put a device minor number.
 268  *
 269  * \param dev device data structure
 270  * \return always zero
 271  *
 272  * Cleans up the proc resources. If it is the last minor then release the foreign
 273  * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 274  * unregisters the character device.
 275  */
 276 int drm_put_dev(drm_device_t * dev)
 277 {
 278         DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
 279
 280         if (dev->unique) {
 281                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 282                 dev->unique = NULL;
 283                 dev->unique_len = 0;
 284         }
 285         if (dev->devname) {
 286                 drm_free(dev->devname, strlen(dev->devname) + 1,
 287                          DRM_MEM_DRIVER);
 288                 dev->devname = NULL;
 289         }
 290         drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 291         return 0;
 292 }
 293
 294 /**
 295  * Put a secondary minor number.
 296  *
 297  * \param sec_minor - structure to be released
 298  * \return always zero
 299  *
 300  * Cleans up the proc resources. Not legal for this to be the
 301  * last minor released.
 302  *
 303  */
 304 int drm_put_head(drm_head_t *head)
 305 {
 306         int minor = head->minor;
 307
 308         DRM_DEBUG("release secondary minor %d\n", minor);
 309
 310         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
 311         drm_sysfs_device_remove(MKDEV(DRM_MAJOR, head->minor));
 312
 313         *head = (drm_head_t){.dev = NULL};
 314
 315         drm_heads[minor] = NULL;
 316
 317         return 0;
 318 }
 319